Discharge device



Filed Aug. 26. 1930 /NVENTOR 14. GE/'/?TS BY ATTO/?NEV patente& Dec. 18, 1934 1,985,028 DISCHARGE DEVICE August Gehrts, Berlin-Friedenau, Germany, as-

signor to Siemens & Halske Aktiengesellschatt, Siemensstadt, near Berlin, Germany, a. German company Application August 26, 1930, Serial No. 177,852 In Germany December 13, 1929 3 Claims. (Cl. 250-275) This invention relates to discharge devices and The anode leading-in wires 2 and 3 and the more particularly to such devices in which the cathode K leading-in wires 4 and 5 are passed leading-in wires for the electrodes are embedded through a vitreous press or stem 1. A plurality in a common vitreous stem or press. of shields 6 and 6', each comprising a wire,

a It is necessary in dscharge devices to seal metal plate or the like are disposed between each 5 electrode leading-in wires of different potentials anode leading-in wire and the adjacent cathode through the wall of an evacuated or gas-filled leading-in wire. A conducting connection for glass vessel. This is the case, for example, in the shields may extend through the press into low discharge lamps or in electron dischar e the evacuated or gas-filled chamber of the ves- 10 devices having anode and cathode leading-in sel. The shields, however, should be entirely 10 wires. In such instances, and particularly when encased by glass and should not projec r m the leading-in wires pass through a press or the glass vessel on the surface exposed to the stem, a liberation of gas sets in when the stem outer atmosphere.

is heated during the operation of the device, The shields 6 and 6' may be connected with which s to be traced to an electrolytic decomthe anode in various ways as shown in the 15 u h a l ad o barum glass, p iv ly, sel and is connected with the anode A externally :u wh ch may n t extend along the entire of the press or stem. However, the shield, such probably due to the fact that the anode and ode leadingm wires 4 and 5 respectively and length of the leading-in wires and pmduee as 6', may be completely embedded in the glass leakage path between the external atmosphere press or stem and electrically connected with and the inside of the vessel which allows a conthe anode leadingm wire 3 inside the press Or tinuous seepage of air into the evacuated or gasstem filled q As s W the In devices of this Construction, the electrolytic 25 compos. lon O Bad g ass ctmpnses 9 es and action occurs in the glass of the stem or press lead oxde and the composton of barum glass between the Shieds 6 and havn a otenal eomprises silicates and barium oxide. This g p decomposition, adjacent the leading-in wires, is the Same as the anode and the adjacent cath` cathode 1eadmg m wires are embedded in the the electric field is therefore confined between 0 t or press relativey close to One another the shield and the adjacent cathode leading-in and an appreciable potential gradient is estab- Wre leaVlng the a e a ih -m wires in a lished therebetween. The decomposition is parp t on o he stem y d s field.

ticularly active when the press or stem becomes W at is claimed is: 5

3 heated to approximately 250 C. 1. In a discharge device, a support, leading- It is an object of this invention, therefore, to in wires embedded in said support, and a conprevent the decomposition of the vitreous press ductive shield wholly embedded in said support or stem adjacent the leadingin wires and to intermediate certain of said leading-in wires,

40 prevent the subsequent seepage of air into the said shield being in contact With an adjacent 40 evacuated or gas-filled vessel. leading-in wire.

In accordance with this invention, this object 2. In a c a g device, an enclosing vessel 's attained by embedding the anode leading-in having a stem, leading-in wires embedded in wire in the press or stem at a point outside the said stem, and a shield wholly embedded in said electric field producing the electrolysis. The st m 'intermediate certain fl s'aid leading-in 45 electric field is confined by placing a shield such w a shield being electrcally c nnected to as a wire, metal plate or the like in the stem one of said leading-in wires adjacent thereto.

or press between the anode leading-in wire and 3. In a discharge device, an enclosing vessel the adjacent cathode leading-in wire. This having a stem, a cathode leading-in wire and shield is entirely sealed from the outside atmosan anode leading-in wire embedded in said 50 phere and is electrically connected to the anode stem, and a shield wholly embedded in said leading-in wire so that it has the same potential. stem intermediate said leading-in wires, said An embodiment of this invention is shown in shield being electrically connected to said anode the accompanying drawing which is a fragleading-in wire.

mentary view of an electron discharge device. AUGUST GEHRTS. 55 

